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We present in this paper polarization dependent four-wave-mixing (FWM) measurements in homogeneously broadened GaAs quantum wells (QW). We have unambiguously demonstrated the important contribution of the two-photon coherence (TPC) between the ground and biexciton states to the nonlinear response. We show for the first time the dominant effects of the TPC on the polarization dependence of FWM. In particular, by including the TPC-induced contribution, we are able to account for the anomalous polarization dependence, a subject of considerable current interest [1].
© 1994 Optical Society of America
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